Designed Synthesis and Supercapacitor Electrode of V₂O₃@C Core‐shell Structured Nanorods with Excellent Pseudo‐capacitance in Na₂SO₄ Neutral Electrolyte

Abstract

V2O3@C core‐shell structured nanorods (VCNR) were successfully prepared using V2O5 nanowires and glucose via a facile hydrothermal route combination of calcination. VCNR comprised of core‐shell structures with V2O3 cores and amorphous carbon shells. Electrochemical properties of VCNR as supercapacitor electrodes were studied in Na2SO4 neutral electrolyte. Results demonstrated that VCNR featured capacitive behavior originating from pseudocapacitance. Specific capacitances of VCNR at 0.5, 1, 2, 5 and 10 A⋅g−1 were achieved to 219, 192, 148, 127 and 119 F⋅g−1, respectively, and VCNR displayed higher specific capacitance than the values of carbon spheres and V2O3 particles. Maximum specific capacitance of VCNR reached 219 F⋅g−1 at 0.5 A⋅g−1 in present study, which was superior to the reported values of V2O3‐based materials and VO2‐based materials. Capacitance retention of VCNR was 100% after 700 cycles and 66% after 1000 cycles. Findings in present study proved that VCNR could be promising candidate as an ideal material for supercapacitors’ electrode.

Scalable Flowing Polymerization and Enhanced Capacitive Properties for Core–Shell Structured Composite Nanofibers toward Highly Efficient Charge Storage in Neutral Electrolytes

“…Therefore, the electrochemical behaviors for polymeric electrode materials were directly evaluated without the influences of additional additives, as a result, relatively poor cycle performance could be observed. However, there is still a significant improvement in the cycling stability could be achieved compared to the previously reported PANi/PPy composite nanofibers and inorganic composites as presented in Table . In particular, when III–PANi nanofibers with a relatively small diameter and smooth surface were used as the seed for the formation of PPy, a compact PPy shell and strong synergistic interaction between PANi core and PPy shell could greatly enhance the structural stability of the composite nanofibers.…”

Carbon coating on metal oxide materials for electrochemical energy storage

“…By far, many researches about metal oxides in morphology control have been exerted. Zhang et al synthesized V 2 O 3 @C nanorod with a thin carbon layer [94]. Seen from the electrochemical analysis, the capacitance retention of V 2 O 3 @C nanorods was 100% and 66% after 700 and 1000 cycles, respectively.…”